Enamino acids 2 and 5 undergo a facile cyclisation to afford the pyrrole 3 and isoindole 6 ring systems; a novel two atom ring expansion ensues when derivatives 5b,d are subjected to the cyclisation conditions, resulting in the formation of the new oxacino[2,3-c]pyrrole system, the structure of which is confirmed by X-ray crystallography.
氨基酸2和5易于环化,形成
吡咯3和异
茚6环系;当衍
生物5b和5d在环化条件下处理时,发生了一种新的两原子环扩展,最终形成新的氧杂环[2,3-c]
吡咯体系,其结构通过X射线晶体学得到了确认。